试验比较了不同麻鸭放养数量（0、75、150、225、300、375只/hm²）对稻鳖田杂草发生、水稻产量和稻米品质的影响。结果表明，随着麻鸭放养数量的增加，稻鳖田各生育时期的杂草数量和总干物质量均逐步减少，以放养数量为375只/hm²处理的除草效果最好;水稻产量随着麻鸭放养数量增加呈先增加后减少的趋势，以放养数量为225只/hm²时最高，同时该处理还改善了稻米食味品质。综合杂草防治效果、水稻产量及稻米品质表现，“稻-鳖-鸭”立体种养模式中麻鸭放养数量以225只/hm²为宜。

By stocking different numbers of sheldrakes （0, 75, 150, 225, 300, 375 /hm²） in the rice and turtle co-cropping field, we compared and analyzed the effects of different numbers of sheldrakes on the occurrence of weeds, yield and quality of rice. The results showed that with the increase of the stocking numbers of sheldrakes, the number of weeds and the total dry matter in each growth period of the rice-turtle co-cropping field gradually decreased, and the treatment with a stocking number of 375 /hm² had the best weed control effects. The yield of rice increased first and then decreased with the increase in the number of sheldrakes sacked, the treatment with the number of stocking was 225 /hm² was the highest. At the same time, this treatment also improved the eating quality of rice. Based on the performance of weed control, rice yield and rice quality, the number of sheldrake stocked in the rice-turtle co-cropping field should be 225 /hm².